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Message-Id: <201105031802.34724.paul.moore@hp.com>
Date: Tue, 3 May 2011 18:02:34 -0400
From: Paul Moore <paul.moore@...com>
To: Samir Bellabes <sam@...ack.fr>
Cc: linux-security-module@...r.kernel.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
netfilter-devel@...r.kernel.org, jamal <hadi@...erus.ca>,
Patrick McHardy <kaber@...sh.net>,
Evgeniy Polyakov <zbr@...emap.net>,
Grzegorz Nosek <root@...aldomain.pl>
Subject: Re: [RFC v3 02/10] Revert "lsm: Remove the socket_post_accept() hook"
On Tuesday, May 03, 2011 10:24:15 AM Samir Bellabes wrote:
> snet needs to reintroduce this hook, as it was designed to be: a hook for
> updating security informations on objects.
Looking at this and 5/10 again, it seems that you should be able to do what
you need with the sock_graft() hook. Am I missing something?
My apologies if we've already discussed this approach previously ...
> Originally, This was a direct revert of commit
> 8651d5c0b1f874c5b8307ae2b858bc40f9f02482.
>
> But from the comment of Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> :
> > Please move security_socket_post_accept() to before fd_install().
> > Otherwise, other threads which share fd tables can use
> > security-informations-not-yet-updated accept()ed sockets.
>
> Signed-off-by: Samir Bellabes <sam@...ack.fr>
> Acked-by: Serge Hallyn <serue@...ibm.com>
>
> snet needs to reintroduce this hook, as it was designed to be: a hook for
> updating security informations on objects.
>
> Signed-off-by: Samir Bellabes <sam@...ack.fr>
> ---
> include/linux/security.h | 13 +++++++++++++
> net/socket.c | 2 ++
> security/capability.c | 5 +++++
> security/security.c | 5 +++++
> 4 files changed, 25 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/security.h b/include/linux/security.h
> index da0d59e..02effe5 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -875,6 +875,11 @@ static inline void security_free_mnt_opts(struct
> security_mnt_opts *opts) * @sock contains the listening socket structure.
> * @newsock contains the newly created server socket for connection.
> * Return 0 if permission is granted.
> + * @socket_post_accept:
> + * This hook allows a security module to copy security
> + * information into the newly created socket's inode.
> + * @sock contains the listening socket structure.
> + * @newsock contains the newly created server socket for connection.
> * @socket_sendmsg:
> * Check permission before transmitting a message to another socket.
> * @sock contains the socket structure.
> @@ -1587,6 +1592,8 @@ struct security_operations {
> struct sockaddr *address, int addrlen);
> int (*socket_listen) (struct socket *sock, int backlog);
> int (*socket_accept) (struct socket *sock, struct socket *newsock);
> + void (*socket_post_accept) (struct socket *sock,
> + struct socket *newsock);
> int (*socket_sendmsg) (struct socket *sock,
> struct msghdr *msg, int size);
> int (*socket_recvmsg) (struct socket *sock,
> @@ -2555,6 +2562,7 @@ int security_socket_bind(struct socket *sock, struct
> sockaddr *address, int addr int security_socket_connect(struct socket
> *sock, struct sockaddr *address, int addrlen); int
> security_socket_listen(struct socket *sock, int backlog);
> int security_socket_accept(struct socket *sock, struct socket *newsock);
> +void security_socket_post_accept(struct socket *sock, struct socket
> *newsock); int security_socket_sendmsg(struct socket *sock, struct msghdr
> *msg, int size); int security_socket_recvmsg(struct socket *sock, struct
> msghdr *msg, int size, int flags);
> @@ -2640,6 +2648,11 @@ static inline int security_socket_accept(struct
> socket *sock, return 0;
> }
>
> +static inline void security_socket_post_accept(struct socket *sock,
> + struct socket *newsock)
> +{
> +}
> +
> static inline int security_socket_sendmsg(struct socket *sock,
> struct msghdr *msg, int size)
> {
> diff --git a/net/socket.c b/net/socket.c
> index d588e9e..7807904 100644
> --- a/net/socket.c
> +++ b/net/socket.c
> @@ -1535,6 +1535,8 @@ SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr
> __user *, upeer_sockaddr, goto out_fd;
> }
>
> + security_socket_post_accept(sock, newsock);
> +
> /* File flags are not inherited via accept() unlike another OSes. */
>
> fd_install(newfd, newfile);
> diff --git a/security/capability.c b/security/capability.c
> index 1f8bbe2..da68c60 100644
> --- a/security/capability.c
> +++ b/security/capability.c
> @@ -593,6 +593,10 @@ static int cap_socket_accept(struct socket *sock,
> struct socket *newsock) return 0;
> }
>
> +static void cap_socket_post_accept(struct socket *sock, struct socket
> *newsock) +{
> +}
> +
> static int cap_socket_sendmsg(struct socket *sock, struct msghdr *msg, int
> size) {
> return 0;
> @@ -1022,6 +1026,7 @@ void __init security_fixup_ops(struct
> security_operations *ops) set_to_cap_if_null(ops, socket_connect);
> set_to_cap_if_null(ops, socket_listen);
> set_to_cap_if_null(ops, socket_accept);
> + set_to_cap_if_null(ops, socket_post_accept);
> set_to_cap_if_null(ops, socket_sendmsg);
> set_to_cap_if_null(ops, socket_recvmsg);
> set_to_cap_if_null(ops, socket_getsockname);
> diff --git a/security/security.c b/security/security.c
> index 84187d8..eda2b75 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -1038,6 +1038,11 @@ int security_socket_accept(struct socket *sock,
> struct socket *newsock) return security_ops->socket_accept(sock, newsock);
> }
>
> +void security_socket_post_accept(struct socket *sock, struct socket
> *newsock) +{
> + security_ops->socket_post_accept(sock, newsock);
> +}
> +
> int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int
> size) {
> return security_ops->socket_sendmsg(sock, msg, size);
--
paul moore
linux @ hp
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